国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

current location：Home > Technical Articles > Daily Programming > HTML Knowledge

  • How do the async and defer html attributes differ for tags?
    How do the async and defer html attributes differ for tags?
    Use async or defer to improve web page performance. async enables scripts to be loaded asynchronously and executed immediately, suitable for independent scripts that do not rely on page content, such as analyzing code; defer delays execution until HTML parsing is completed, suitable for scripts that need to access the DOM or execute in sequence; both avoid blocking HTML parsing, but defer can ensure execution order and be safer. Selection suggestions: Use defer first, unless it needs to be executed as early as possible and has no dependencies.
    HTML Tutorial . Web Front-end 466 2025-06-30 01:15:21
  • What are global html attributes?
    What are global html attributes?
    Global HTML attributes are suitable for all elements, used to change behavior or provide additional information. class is used for CSS style and JS selection; id is a unique identifier; style implements inline style; data-* stores custom data; title displays tooltips. These attributes are very practical and widely used in web development.
    HTML Tutorial . Web Front-end 583 2025-06-30 01:12:11
  • How do I use the muted attribute to mute the video playback?
    How do I use the muted attribute to mute the video playback?
    To automatically mute the video, use the muted property in the HTML tag. The specific steps are as follows: 1. Add muted attributes to the video tag to achieve muted playback when the page is loaded; 2. It can be used in combination with other attributes such as autoplay, loop, controls, etc.; 3. If you encounter browser restrictions or script conflicts, you can set video.muted=true and video.volume=0 through JavaScript as a supplementary solution; 4. If you want to allow users to unmute, add controls attributes to allow users to manually turn on the sound.
    HTML Tutorial . Web Front-end 629 2025-06-30 01:05:21
  • What is the difference between class and id html attributes?
    What is the difference between class and id html attributes?
    Use id to select unique elements and use class to select multiple elements. 1.id is used for unique elements, such as navigation bar and main content area, suitable for direct links and anchor point positioning; 2.class is used for repeating styles or behaviors, such as buttons and cards, and supports combination use; 3. Consider whether uniqueness is required when selecting, use id if unique, otherwise use class; 4. Get a single element through document.getElementById in the script, and multiple elements are obtained through document.getElementsByClassName or document.querySelectorAll; 5. The priority of id in CSS is higher than class, making it more difficult to overwrite
    HTML Tutorial . Web Front-end 818 2025-06-30 01:04:02
  • What are semantic HTML elements, and how do they improve the structure and accessibility of web pages?
    What are semantic HTML elements, and how do they improve the structure and accessibility of web pages?
    Semantic HTML elements improve web structure, accessibility, and SEO by explicitly tagging content types. 1. Semantic tags such as, , etc. define the page outline, making the code more readable and has built-in levels; 2. Improve barrier-free access, and the screen reader can recognize navigation, main content and other areas, which is convenient for quick operation; 3. It helps SEO, and search engines can better understand the content context and improve indexing efficiency. Using semantic HTML not only optimizes the development process, but also ensures that the website is more friendly and effective to all users.
    HTML Tutorial . Web Front-end 509 2025-06-30 00:41:32
  • What are the rules for nesting HTML tags correctly?
    What are the rules for nesting HTML tags correctly?
    Correct HTML tag nesting first, to ensure that each open tag has the corresponding closed tag and close in reverse order. Secondly, to follow semantic rules to avoid unreasonable nested structures. Specifically: 1. Close the tags in the order of "open and close first"; 2. Block-level elements can contain other block-level or in-line elements, while in-line elements can usually only contain in-line elements or text; 3. Avoid nesting content in self-closing tags (such as, ); 4. Use indentation to improve code readability and reduce errors. Following these rules ensures that the browser correctly parses the HTML structure and maintains layout consistency.
    HTML Tutorial . Web Front-end 974 2025-06-30 00:33:11
  • How do I use the and elements to group and style table columns?
    How do I use the and elements to group and style table columns?
    Use and can simplify table column style settings. 1. When wrapping multiple tags, you can directly apply styles such as background color and width for the entire column; 2. It must be placed in the inner header, and supports the definition of multi-column styles for the span attribute; 3. Only some CSS attributes are supported, and are not suitable for complex layouts or differentiated styles; 4. Suitable for large tables or scenarios where cell structure cannot be controlled, but attention should be paid to browser compatibility and separation of structure and styles.
    HTML Tutorial . Web Front-end 539 2025-06-29 02:11:31
  • How do I use the element to represent dates and times?
    How do I use the element to represent dates and times?
    Tags are used to semantically represent time, which is both understandable and easy for machine recognition. 1. The basic writing method is to display the time of the package and use the datetime attribute to provide the time value in ISO8601 format, such as March 15, 2025; 2. A more accurate time point can be represented by adding the time part, the format is YYYY-MM-DDTHH:MM, such as 3:15 pm on March 15; 3. pubdate was used to identify the release time, but it has been abandoned, and it is recommended to use microdata or JSON-LD instead; 4. Combined with structured data (such as Schema.org) you can realize the event reminder function, such as search engines that can identify activity time and display rich media summary. The key to mastering is to use datetime to provide standard formats
    HTML Tutorial . Web Front-end 153 2025-06-29 02:10:52
  • What are the best practices for using and HTML tags?
    What are the best practices for using and HTML tags?
    The key to using HTML tags reasonably is clear semantics and reasonable structure to improve accessibility and SEO. 1. Use HTML5 semantic tags such as, ,,,, and accurately describe the content role; 2. Pack independent content, represent blocks with titles, for navigation, and place sidebar information; 3. Correctly nest and close tags, avoid cross-necking, and give priority to using semantic tags to cooperate with CSS layout; 4. Use native controls such as interactive elements, and enhance the barrier-free experience with ARIA attributes.
    HTML Tutorial . Web Front-end 810 2025-06-29 02:10:11
  • What is the rel in html attributes and what are its common values like nofollow or noopener?
    What is the rel in html attributes and what are its common values like nofollow or noopener?
    rel stands for "relationship" in HTML, which describes the relationship between the current document and the linked resource. Common rel values ??are: 1.nofollow, which tells search engines not to track links or pass weights, which are suitable for user-generated content or paid links; 2.noopener, which improves security and prevents new pages from accessing window.opener attributes, which should be used every time target="_blank" is used; 3.noreferrer, which prevents the sending of HTTPReferer headers to protect user privacy; 4.canonical, which is used to help search engines identify the main version URL and avoid duplicate content problems. Choose the appropriate rel value.
    HTML Tutorial . Web Front-end 324 2025-06-29 02:03:21
  • How do you comment out HTML tags?
    How do you comment out HTML tags?
    TocommentoutHTMLtags,usethesyntax.PlacetheHTMLcodebetween,whichmakesbrowsersignorethecontent.Forexample,preventsthebrowserfromdisplayingtheparagraphwhenthepageloads.
    HTML Tutorial . Web Front-end 241 2025-06-29 02:03:03
  • What is the purpose of the name and value html attributes in a form?
    What is the purpose of the name and value html attributes in a form?
    InHTMLforms,thenameattributeprovidesthekeyinkey-valuepairssenttotheserver,whilethevalueattributeprovidestheactualdata.1)Thenameattributeidentifiestheformfield,andwithoutit,inputisn'tincludedinsubmissions.2)Italsogroupsrelatedelementslikeradiobuttons.
    HTML Tutorial . Web Front-end 458 2025-06-29 01:59:51
  • How do I link to external CSS stylesheets in an HTML document using the element?
    How do I link to external CSS stylesheets in an HTML document using the element?
    To link an external CSS stylesheet to an HTML document, use tags in the HTML file and ensure that the path is correct and the properties are complete. 1. Place the tag in to ensure that the browser is loading styles first; 2. Make sure that the path in the href attribute is correct, which can be a relative path or a superior directory path; 3. Always use rel="stylesheet" to define the linked resource as a style sheet; 4. If you need to introduce multiple style sheets and list the tags in turn, the subsequent styles will override the previous conflict rules, and the order needs to be reasonably arranged.
    HTML Tutorial . Web Front-end 1001 2025-06-29 01:59:31
  • What is the difference between and HTML tags?
    What is the difference between and HTML tags?
    and is used for pure style bold and italics, without semantics; and is used to emphasize content. 1. Make the text bold and italicize the text, both of which only affect the appearance. 2. It indicates important content, usually displayed in bold; it indicates emphasis, usually displayed in italics. 3. If the style effect is required and there is no emphasis on intention, use or; if the importance or tone changes are needed, use or.
    HTML Tutorial . Web Front-end 686 2025-06-29 01:48:42

Tool Recommendations

jQuery enterprise message form contact code

jQuery enterprise message form contact code is a simple and practical enterprise message form and contact us introduction page code.
form button
2024-02-29

HTML5 MP3 music box playback effects

HTML5 MP3 music box playback special effect is an mp3 music player based on HTML5 css3 to create cute music box emoticons and click the switch button.

HTML5 cool particle animation navigation menu special effects

HTML5 cool particle animation navigation menu special effect is a special effect that changes color when the navigation menu is hovered by the mouse.
Menu navigation
2024-02-29

jQuery visual form drag and drop editing code

jQuery visual form drag and drop editing code is a visual form based on jQuery and bootstrap framework.
form button
2024-02-29

Organic fruit and vegetable supplier web template Bootstrap5

An organic fruit and vegetable supplier web template-Bootstrap5
Bootstrap template
2023-02-03

Bootstrap3 multifunctional data information background management responsive web page template-Novus

Bootstrap3 multifunctional data information background management responsive web page template-Novus
backend template
2023-02-02

Real estate resource service platform web page template Bootstrap5

Real estate resource service platform web page template Bootstrap5
Bootstrap template
2023-02-02

Simple resume information web template Bootstrap4

Simple resume information web template Bootstrap4
Bootstrap template
2023-02-02

Cute summer elements vector material (EPS PNG)

This is a cute summer element vector material, including the sun, sun hat, coconut tree, bikini, airplane, watermelon, ice cream, ice cream, cold drink, swimming ring, flip-flops, pineapple, conch, shell, starfish, crab, Lemons, sunscreen, sunglasses, etc., the materials are provided in EPS and PNG formats, including JPG previews.
PNG material
2024-05-09

Four red 2023 graduation badges vector material (AI EPS PNG)

This is a red 2023 graduation badge vector material, four in total, available in AI, EPS and PNG formats, including JPG preview.
PNG material
2024-02-29

Singing bird and cart filled with flowers design spring banner vector material (AI EPS)

This is a spring banner vector material designed with singing birds and a cart full of flowers. It is available in AI and EPS formats, including JPG preview.
banner picture
2024-02-29

Golden graduation cap vector material (EPS PNG)

This is a golden graduation cap vector material, available in EPS and PNG formats, including JPG preview.
PNG material
2024-02-27

Home Decor Cleaning and Repair Service Company Website Template

Home Decoration Cleaning and Maintenance Service Company Website Template is a website template download suitable for promotional websites that provide home decoration, cleaning, maintenance and other service organizations. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-05-09

Fresh color personal resume guide page template

Fresh color matching personal job application resume guide page template is a personal job search resume work display guide page web template download suitable for fresh color matching style. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-29

Designer Creative Job Resume Web Template

Designer Creative Job Resume Web Template is a downloadable web template for personal job resume display suitable for various designer positions. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28

Modern engineering construction company website template

The modern engineering and construction company website template is a downloadable website template suitable for promotion of the engineering and construction service industry. Tip: This template calls the Google font library, and the page may open slowly.
Front-end template
2024-02-28